Expired Canadian patentCanada
Process to upgrade coal liquids
CA 1163942 A · Owner: Sun Tech, Inc. · Inventors: Janoski, Edward J.; Schneider, Abraham; Hollstein, Elmer J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxygen compounds are removed e.g. by extraction, from a coal liquid prior to its hydrogenation. As a result compared to hydrogenation of such a non-treated coal liquid the rate of nitrogen removal is increased.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 20, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 20, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 23, 1981
GrantedMarch 20, 1984
Term endedMarch 20, 2001
Patent numberCA 1163942 A
Classification (IPC)C10G1/00 +2 more
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.